NI-9481

NI-9481

I am working on a new experimental set up for my thesis and I want to
control the whole process using LabView 8.

The set up has two chambers each one connected to a capacitance manometer and, 4
solenoid valves (not proportional, only ON/OFF) to control the flow.

My goal is to open the valves when the pressure reaches a certain value
in each chamber using LabView. For this task I purchased the cRIO-9481 with USB-9162
interface.

For the capacitance manometers I have ordered a Power Supply with an Rs-232
interface. I have not received yet the manometers but I am trying to build VI by
comparing two numbers (one set-up by me through a numeric control and the other is the
iteration count in a while loop). When the two numbers match I want to trigger one relay
on the NI-9481.

I don't know how ot integrate the NI-9481 in the VI. Any Suggestions ?

Re: NI-9481

Your application sounds very interesting! I actually worked on a project a few years back developing a vacuum chamber control system using LabVIEW and SCXI, so I know where you're coming from.

The DAQmx driver makes controlling the relays on the USB-9481 very easy. You can use the DAQmx shipping examples for digital I/O in LabVIEW as a guide for how to do this. I would suggest looking at either of the examples Write Dig Port or Write Dig Chan. These can be found by going to Help >> Find Examples and then navigating to Hardware Input and Output >> DAQmx >> Digital Generation. This will provide the basic functionality for switching the relays.

In terms of your control algorithm, you can use the functions in the Programming >> Comparison palette to implement the logic for decision-making.

Hopefully this information will help you to get started with your application.

Re : NI-9481

Not really, I just found someone who made a similar thing with more research because I did not have any answers to my question for the moment (and it is not a problem, I can wait, I just do not like waiting without doing something)

As I cannot send a message to gcf, I try to let a comment here with the hope that he will see it easly.

I continue my research so if I ask another question, be ready to say "duplicate"

Re: Re : NI-9481

Of course it's a duplicate of your original post and you just have to show a little patience. This is not only a duplcate, but a very old thread and you are un likely to get a response from someone that has not posted in over 4 years - or did you not check that?